Brake-shoe.



G W. ARMBRUST.

BRAKE SHOE.

' APPLICATION FILED JAN. 18, 1911.

Patented N0v. 28, 1911.

Z SHEETEk-SHEET 1.

0. W. ARMBRUST.

BRAKE SHOE.

APPLICATION FILED JAN. 18,1911.

1,010,009. Ptented Nov. 28, 1911.

2 BHEETS-SHEET 2.

TITNTTED STATES PATFLN T @FFTCE.

CHARLES W. ARMBRUS'I, 0F CRYSTAL LAKE, ILLINOIS, ASSIGNOR OF ONE-FOURTH 'IQ SYDNEY STEIN, OF CHICAGO,

ILLINOIS.

BRAKE-SHOE.

This invention relates to brake shoes, and

my present embodiments relate more particularly to that type or'class 'of brake shoes known as interlocking shoes, wherein the back and face .of theshoes are provided with interlocking means, whereby a partially worn shoe can be detached from the head and applied to the wearing face of a new shoe, so that the partially worn shoe may be completely used up.

One of the novel features of my present invention resides in a construction wherein the interlocking parts on the back and face of the shoe respectively are of such a character that two similar shoe bodies or one whole shoe body and another partially worn shoe body can be brought into interlocking relation by placing the bodies with the face of one against the back of the other, and giving them a slight relative longitudinal movement, so as to bring the interlocking parts into cooperative relation. In the present invention the interlocking parts are so constructed and arranged that the shoe bodies may be interlocked by imparting a relative longitudinal movement to the bodies in either direction, that is, when the bodies are properly positioned with the face of one against the back of the other, they may be Specification 01 Letters Patent. -App1icaticn filed January 18, 1911.

Patented Nov. 28, 1911. Serial No. 603,267.

lugs I have equipped the back of my improved shoe with a plurality of transversely arranged ribs, spaced from the centrally disposed attaching lug a sufiicient distance to enable the attaching lugs of the brake head to. be positioned between these ribs and the attaching lug on the shoe, so that the sides of the lugs of the' brake head will be engaged by said transversely disp sed ribs and the ends or sides of the attaching lug of the shoe thereby preventing the shoe from-being displaced or thrown out of alinement. v

other novel features of construction and many of the objects and advantages of this invention will be apparent as it becomes better understood from the following description when taken in connection with the accompanying drawings, illustrating prelnterlocked by moving one of the bodies;

2 central locking shoulder.

relatively to the other longitudinally in either direction. This construction'p'ermits l -most on the brake head.

Another feature of my invention consists in eliminating the usual guide and thrust lugs which are ordinarily provided to engage with the end prongs of the brake head for the purpose of preventing the shoe from becoming displaced or thrown out of alinement. In lieu of the usual thrust and guide the shoulder,

ferred embodiments thereof.

Referring to the drawings,Figure 1 is a side elevation of a brake shoe embodying my invention, the shoe being shown as attached to a brake head; Fig. view of one form of my improved shoe; Fig. 3 is a bottom view thereof; Fig. 4 is a View similar to Fig. l, of the shoe; Fig. 5 is a sectional elevation on the line 5.5 of Fig. 4: Fig. 6 is a sectional elevation on the line 66 of Fig. 4; Fig. 7 is a detailed fragmentary sectional view on the line 77 of Fig. 4, showing one locked position of the means for locking two shoe bodies together; and Fig. 8 is a View similar to Fig. 7, showing another locked position of said locking means. Fig. 9 is afragmentary plan View of the central port-ion of a shoe showing the shape of the On the drawings,

10 designates the main body of the shoe on the back of which and disposed centrally thereof is provided a projecting shoulder 11 (Fig. 5). The central portion 12 of the side Walls of this shoulder is disposed at right angles to the base 13 of while the end portions 14 of the walls are undercut to form a dove-tail connection with a detachable undercut attaching lug 15 or with the recess 0n the face of a similarly shaped shoe. The side walls showing a modified form 2 is a top plan of a centrally disposed recess 16, w th which a shoulder constructed as above described is adapted to interlock, are undercut at 17 in the center and adjacent the ends of the walls,

.leaving between such undercut portions be evident that after such shoulder has been one end and the centrally undercut portion.

.inserted into the recess, the bodies may be moved longitudinally in either direction to efiect locking engagement between the shoulder and the undercut walls of the recess.-

Such relative longitudinal movement will dispose the undercut end portions of the shoulder in interlocking engagement with of the side walls of said recess.

Spaced from the locking shoulder 11 and upon either side thereof, I have provided transversely arranged ribs 18. These ribs are adapted to perform the function of the usual guide and thrust lugs in preventingdisplacement of the shoe and maintaining the same in proper alinement, and also to space one shoe away from another shoe when interlocked. I

From Fig. 1 it will be apparent that the attaching prongs 19015 the brake head 20, which is of a well known type, fits snugly between the sides of the shoulder 11 and the transverse ribs 18. The close engagement between the prongs l9 and the ribs 18 will prevent the body of the shoe from twisting relatively to' the head sufliciently to be thrown out of alinement. It will be evident that this construction obviates the usual guide and thrust lugs which customarily engage with the end prongs 21 of the brake head for the purpose of maintaining the shoe in alinement. s

Upon and integral with the back of the shoe and between the ends thereof and the ribs 18, I have provided locking lugs 22 of a general shape and contour shown in Figs. 2 i and. 8. The portions 23 of the side walls of-these lugs are disposed vertically .with respect to the back of the shoe, while the parallel portions 24 and the tapering portions 25 are undercut forthe purpose of effecting interlocking engagement with suitably shaped recesses provided on the face of a similar shoe body. In addition to the centrally disposed recess 16 which has been previously described, the face of the shoe is provided with recesses 26 of the same general shape and contour as the locking lugs 22, with which the side walls of the recess interlock- 'ingly engage. The wider portion 27 of these rrecesses has vertical side walls while the narrower portion 28 and the tapered portion 29 has undercut side walls for engagement with the undercut portions 24 and 25 respectively of the locking lugs 22.

VVhen it is desired to attach a new or a partially worn body to the face of a new shoe on the brake head, the back of the body to be attached is so positioned against the face of the other body that the wide portion of the locking lugs 22 between the undercut walls 24 will slip into the recess 26 between the vertical walls 27 thereof, the

tapered portions of the lugs slipping into the tapered portions of the recesses. If now the movable body member or in other words,

the member to be attached, be moved longitudinally of the new member toward the right, viewing Figs. 1, 4 and 7, theundercut portions 24 and 25 of the lug 22 at the-right end of the shoe will lockingly engage with the undercut walls 28 and 29 respectively of the corresponding recess 26, while the under- I cut walls 24 of the lug 22 at the opposite end 'of the body will lockingly engage with the undercut walls 29 of its respective recess 26. This relative longitudinal movement of the body members will also bring the undercut portions 14' of the shoulder 11 into locking engagement with the undercut portions 17 of the walls of the centrally'di'sposed recess 16.

Should the body members be moved relatively in the opposite direction from that above indicated, the undercut portions 24 of the lug 22 at the right end of the body will engage with the undercut walls 29 of the recess 26 in the relation shown in Fig. 8, while the lug and recess disposed at the opposite ends of the members will'lockingly engage in the position shown in Fig. 7.

It is thus apparent that when the locking lugs areinserted into their respective recesses, the body'members may be rigidly.

locked together by moving said members relatively and longitudinally in either direction.

As shown in Fig. l the ends of the back of the removable shoe body lie flat against the ends of theface of the fixed shoe, while the central portions of the shoe are spaced some little distance apart, the ribs 18 Qnthe old shoe acting as spacing ribs to insurethispermitting a thinner shoe to be employed and insuring greater transverse strength thanwould be secured were the face of the shoe deeply socketed at this point.

-' In Fig. 4 the ends of the bodies at their back are provided with spacing ribs 30- which also insure separation of the shoes throughout their length, thereby reducing the depth of the recess 26 and proportionately increasing the strength of the shoes at this point. Invthis modification of the shoes, the ribs 18 are necessarily somewhat longer than the ribs shown in Fig. 1,.which construction not only decreases the depth of the central recess or socket 16but also insures a more rigid engagement and greater nevertheless be obvious that slight changes I and dimensions 7 and variations in the form of the parts herein shown and described can be made Without departing of the invention or sacrificing any of the material advantages thereof.

I claim:

l. A brake shoe comprising a body member provided with an attaching lug, and transversely disposed ribs spaced from said attaching lug, said lug and ribs forming transverse bearing faces to engage the transverse faces of the brake head attaching prongs whereby the brakeshoe is maintained in alinement.

2. A brake shoe comprising a body member provided with an attaching lug, and ribs either side of said lu said being adapted to engage the transverse faces of the brake head attaching prongs to maintain the brake shoe in alinement.

3. A brake shoe comprising a body member having an attaching lug, and trans versely disposed spacing ribs elevated above the back of the shoe to provide transverse bearing surfaces adapted to engage with the holding prongs of a brake head and prevent displacement. of the brake shoe.

4:. A brake shoe comprising a body member having a centrally disposed shoulder arranged upon the back thereof, said shoulder being adapted for the attachment thereto of .an attaching lug, transverse ribs disposed said shoulder, and lock upon either side of ing lugs disposed between said ends of the shoe.

" 5. An interlocking brake shoe comprising a body member formed with intermediate and end locking recesses in its face, inter,-

ribs and the mediate'and end locking lugs on the back of said member, and transversely disposed spacing ribs positioned between said intermediate and end locking lugs.

6. An interlocking brake shoe comprising comprising back with and a pair of locking lugs spaced from said,

from the spirit l apart throughwhereby the locking lugs on a similar shoe may be introduced into said recesses and said shoes locked firmly together upon relative longitudinal movement of said shoes in either direction.

8. An interlocking brake shoe comprising a body member formed with a plurality of recesses on its of said dercut walls,

plurality of locking lugs, the sides thereof being shaped to form for locking engagement with the recesses of a similar shoe, whereby the shoes may be locked together upon the introduction of said locking lugs into the recesses by relative longitudinal movement of the shoes in either directio 9. An interlocking brake shoe comprising a body member having a plurality of looking lugs on its back, the side walls of each of said lugs being undercut adjacent the ends thereof, and a plurality of recesses on its face, the side walls of said recesses being undercut adjacent the ends thereof, whereby upon introduction of said locking lugs into the recesses of a similar shoe, the shoes may be locked together by relative longitudinal movement of the shoes in either direction.

10. An interlocking brake shoe comprising a body member, provided with a centrally disposed locking lug, the side walls cesses of a locking lug on a similar shoe, said shoes may be locked together upon relative longitudinal movement of the shoes in either direction.

11. An interlocking brake shoe comprisa body member having three locking lugs projecting from the back thereof, the side walls of said lugs being undercut throughout a portion of their length, the

direction. 12. An interlocking brake shoe comprismg a body member provided on its face with lockingrecesses and on its back with look ng lugs adapted to interlock with the locking recesses of a similarly shaped shoe,

said shoe also having onits back transversely disposed ribs adapted to engage with the fastening prongs of a brake head and maintain the shoe in'alinement and spacing ribs located adjacent its ends, said trans-' verse and end spacing ribs serving to space the back and face of interlocked shoes apart throughout their length.

13.-An interlocking brake shoe comprising a body member provided on its facev adapted to receivethe locking lugs of a similarly shaped shoe, said lugs and recesses being formed'to effect interlocking engagement of the shoes upon relative longitudinal movement thereof 1n either direction.

15. An interlocking brake shoe compris' ing a .body member provided with means back with central and end locking lugs and on its facewith central and end locking recesses adapted to receive'the lugs of a similarlyshaped shoe, said lugs and recesses being formed to effect locking engagement ofthe shoes upon longitudinal movement in either direction.

CHARLES w. ARMBRUST.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 0! Patents.

Washington. D. c. I

lues-i 

